Donald Trump has a long history of doing what he thinks is best for Donald Trump. If he needs to discard friends, allies or wives along the way, so be it. “I’m a greedy person,” he has explained.

It’s important to keep this trait in mind when trying to make sense of the Russia story. Trump’s affinity for Russia, after all, is causing problems for him. It has created tensions with his own staff and his Republican allies in Congress. Most voters now believe he has something to hide. And the constant talk of Russia on television clearly enrages Trump.

He could make his life easier if only he treated Vladimir Putin the way he treats most people who cause problems — and cast Putin aside. Yet Trump can’t bring himself to do so.

This odd refusal is arguably the biggest reason to believe that Putin really does have leverage over Trump. Maybe it’s something shocking, like a sex tape or evidence of campaign collusion by Trump himself. Or maybe it’s the scandal that’s been staring us in the face all along: Illicit financial dealings — money laundering — between Trump’s business and Russia.

The latest reason to be suspicious is Trump’s attacks on a formerly obscure Justice Department official named Bruce Ohr. Trump has repeatedly criticized Ohr and called for him to be fired. Ohr’s sin is that he appears to have been marginally involved in inquiries into Trump’s Russian links. But Ohr fits a larger pattern. In his highly respected three-decade career in law enforcement, he has specialized in going after Russian organized crime.

It just so happens that most of the once-obscure bureaucrats whom Trump has tried to discredit also are experts in some combination of Russia, organized crime and money laundering.

It’s true of Andrew McCabe (the former deputy F.B.I. director whose firing Trump successfully lobbied for), Andrew Weissmann (the only official working for Robert Mueller whom Trump singles out publicly) and others. They are all Trump bogeymen — and all among “the Kremlin’s biggest adversaries in the U.S. government,” as Natasha Bertrand wrote in The Atlantic. Trump, she explained, seems to be trying to rid the government of experts in Russian organized crime.

I realize that this evidence is only circumstantial and well short of proof. But it’s one of many suspicious patterns about Trump and Russia. When you look at them together, it’s hard to come away thinking that the most likely explanation is coincidence.

Consider: The financially rickety Trump Organization, shunned by most mainstream banks, long relied on less scrupulous Russian investors. “Russians make up a pretty disproportionate cross-section of a lot of our assets,” Donald Trump Jr. said a decade ago. “We have all the funding we need out of Russia,” Eric Trump reportedly said in 2013. And what was the rare major bank to work with Trump? Deutsche Bank, which has a history of illegal Russian money laundering.

Trump also had a habit of selling real estate to Russians in all-cash deals. Money launderers like such deals, because they can turn illegally earned cash into a legitimate asset, usually at an inflated price that rewards the seller for the risk. One especially dubious deal was Trump’s $95 million sale of a Palm Beach house to a Russian magnate in 2008 — during the housing bust, only four years after Trump had bought the house for $41 million.

Then there is Trump’s paranoia about scrutiny of his businesses. He has refused to release his tax returns. He said that Mueller’s investigation would cross a red line by looking into his finances. When word leaked (incorrectly) that Mueller had subpoenaed Deutsche Bank’s records on Trump, he moved to fire Mueller (only to be dissuaded by aides). Trump is certainly acting as if his business history contains damaging information.

Leonhardt speaks with Adam Schiff who wants to investigate all this in the ew congress.